Expansion shield



Patented Sept. 14, 1926.

UNITED STATES HENRY G. OSBORNE, OF EAST RUTHERFORD, NEW JERSEY.

EXPANSION SHIELD.

Application led September ,11, 1923. Serial No. 662,047'.

The invention relates to expansion shields for anchoring screws or bolts in holes drilled into brick, stone, concrete or the like, and it consists in certain improvements on or developments of the invention described and claimed in Letters Patent No. 1,066,040 granted to me on July 1, 1913.

The expansion shield of my aforesaid patent comprised two corresponding longitudinal semi-cylindrical sections to receive between them the screw to be anchored, and said sections were normally free of each other except at theirinner or forward ends where they were connected together by a portion affording a wedge to be driven between said sections for expanding them outwardly against the walls of the hole in which the shield was used.

In accordance with my present invention, asidefrom details, I connect the outer or rear ends of thelongitudinal sections of the shield by an integral portion of the metal thereof and thence separate said sections throughout the rest of their entire length, the line of separation extending through a wedge porion of the shield provided at the .inner or forward end thereof and adapted to be driven between said sections for eX- panding them outwardly against the walls of the hole in which the shield is used. f I also longitudinally rib and forwardly taper the opening` through the shield Which receives the screw, and also longitudinally rib and forwardly taper the exteriorl of the shield, for securing an vimproved binding action of the shield against the walls of the hole.

The invention will be fully understood` the same, taken on the dotted line 2-2 ofy Fig. 1;

Fig. 3 is a side elevation of the shield as distorted by driving the forward wedge portion between the longitudinal sections of ,the shield; Fig. 3 being presented to illustrate that under longitudinal pressure the` normally separated members of the wedge come together and act efhciently to expand the main sides of the shield outwardly, and

Fig. l is an outer or Vrear end view, on an enlarged scale, of the shield in its normal condition. l l

In the drawings 10, 10 designate the two corresponding longitudinal semi-cylindrical orhalf-sections of the shield, said sections being connected together at the opposite sides of their outer ends only'by integral portions 11 of the metal thereof, whence said sections are wholly separated throughout their entire length at each side of the shield by longitudinal slots 12, 13 and the yadjacent ends of forwardly diverging slots 14 which open into the adjacent ends of the slots 12,13.

The slots 14 at both sides of the shield diverge forwardly from the rear ends of the slots 13 and forward ends of the slots 12, and by their divergence said slots 14 form wedge members 15 at each side of each slot 13 and corresponding inclined surface 16 at opposite sides of each slot 12, said surfaces 16 converging rearwardly and leading directly into the forward ends of said slots 12. The wedge members 15 are, at each side of the shield, wholly separated from each other by the slots 13 which lie between said members, and this separation of the members 15 at both sides of the shield is of particular advantage and constitutes a main feature of my invention. The slots 13 not only separate the wedge members 15 at both sides of the shield but entirely separate the forward portions of the sections 10, 10 from each other, as shown in Fig. 1.

The interior chamber of the shield tapers forwardly from end to end, and the walls of said chamber are longitudinally ribbed, as at 17, there preferably being sin equally distributed ribs 17 and said ribs being of Vsshape in cross-section so `as to present reasonably sharp edges to the threads of the screw to be introduced into the shield. The ribs 17 taper forwardly in harmony with the taper of the walls of the chamber of the shield, and said chamber except at said ribs is circular in cross-section. Y

The exterior of the body of the shield tapers forwardly correspondingly with the taper of the interior chamber thereof, and said body is formed with exterior longitudinal ribs 18 which present Vreasonably vsharp edges to the walls of the hole into vwhich the shield vis inserted. The ribs 18 preferably correspond in vnumber Awith .the ribs 17 and are in the plane of said ribs 17,

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the ribs 17, in cross-section, projecting inwardly and the ribs 1S projecting outwardly, whereby between the ridges of the ribs there is contained a suflicient body of metal to spread laterally, when the shield is condensed within the hole receiving it, and substantially fill the spaces initially between the ribs.

In making use of my shield, the hole to receive the shield may be a little less in depth than the length of the shield, and upon the .insertion of that end of the shield having the slots 13 the outer end thereof may be struck by a hammer, as in the act of driving the shield into the hole, this causing the wedge members 15 to move toward each other and outwardly and enter the forwa'd end of the slot 12 and consequently resulting in the expansion of the shield against the walls of said hole to a suflicient extent to prevent the rotation of the shield when the screw is inserted therein. The wedge members 15 are permitted to e'l'liciently act in the manner just described, by reason of the fact that at each side of the shield said members are divided or in pairs and that the entire forward end of the shield is divided throughout by the slots 13 which extend rearwardly between and separate said wedge members. The ribs 18 yield to the walls of the hole when the shield is expanded outwardly by the wedge members 15, and this further tends to bind the shield in the hole and avoid rotation thereof. After the shield has been properly entered into the hole, the screw may be applied, and this will further eX- pand the shield and tend to draw the wedge members outwardly into the slots 12 until :finally the shield and screw become lirmly anchored within the hole receiving them. ln using the shield in a hole deeper than the length of the shield, the screw may be relied upon to spread the separated wedge members 15 further apart, this action being possible only by reason of the slots 13 dividing the wedge members into pairs at each side of the shield and dividing the entire forward end of the shield from the slots 14 forwardly into two separate sections capable of independent action. The interior ribs 17 facilitate the engagement of the threads of the screw with the shield.

The shield will preferably be formed in one integral piece ef lead or like material.

that l claim as my invention and desire to secure by Letters-Patent, is:

1. An expansion shield of the character described consisting of two corresponding longitudinal sections having a forwardly tapered chamber between them to receive a screw and connected together only at their outer or rear end portions, said sections being separated at opposite sides of the shield by longitudinal slots extending forwardly from said points of connection entirely through the shield, and said sections having slots which di verge forwardly at each side of the shield from said longitudinal slots, whereby separated wedge members and corresponding inclined surfaces are formed at opposite4 sides of said longitudinal slots and at each side of the shield for use in expanding the shield.

9.. An expansion shield of the character 2 described consisting of a plurality of corresponding longitudinal sections forming an interior chamber to receive a screw and connected together only at their outer or rear end portions, said sections each having near its forward end independent integral wedge members to be driven outwardly between the longitudinal sections for expanding them on the upsetting of the forward end of the shield, and the shield having slots which eX- screw and connected together only at their outer or rear end portions, said sections being separated at opposite sides of the shield by longitudinal slots extending forwardly from said points of connection entirely through the shield, and said sections having slots which diverge forwardly at each side of the shield from said longitudinal slots, whereby separated wedge members and corresponding inclined surfaces are formed at opposite sides of said longitudinal slots and at each side of the shield for use in expanding the shield, said shield being tapered on its exterior surfaces.

t. An expansion shield of the character described consisting of two corresponding longitudinal sections having a forwardly tapered chamber between them to receive a screw and connected together only at their outer or rear end portions, said sections being separated at opposite sides of the shield by longitudinal slots extending forwardly from said points of connection entirely through the shield, and said sections having slots which diverge forwardly at each side of the shield from said longitudinal slots, whereby separated wedge members and corresponding inclined surfaces are formed at opposite sides of said longitudinal slots and at each side of the shield for use in expanding the shield, said shield being tapered throughout its length from its outer or rear end to its forward or entering end.

5. An expansion shield of the character described consisting of a plurality` of corresponding longitudinal sections forming an interior chamber to receive a screw and connected together only at their outer or rear end portions, said sections each having near its forward end independent integral wedge members to be driven outwardly between the longitudinal sections for expanding them on the upsetting of the forward end of the shield, said shield being tapered on its eX- terior and its interior chamber being,` also 10 tapered.

Signed at New York City, in the county of New York and State of New York, this 7th day of September, A. D. 1923.

HENRY G. OSBORNE. 

